Question

The speed of light in substance X is 1.25 x 108 m/s and that in air is 3 x 108 m/s. The refractive index of this substance will be:; A. 2.4; B. 0.4; C. 4.2; D. 3.75

Answer 1

Answer:b

Explanation:

Answer 2

Answer:

The refractive index of substance = Speed of light in air / speed of X medium

= 3 × 10^8 / 1.25 × 10^8

= 3 ×100 / 125

= 2.4.

Option A. 2 4 is right answer.

$hope \: its \: help \: you$

✌︎✌︎.....